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Analysis

  • max time kernel
    16s
  • max time network
    17s
  • platform
    windows7_x64
  • resource
    win7-20240729-en
  • resource tags

    arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
  • submitted
    02/08/2024, 01:03

General

  • Target

    bee3166e-ee10-4712-aa10-231525ee781c.exe

  • Size

    304KB

  • MD5

    2fd79512c600edbc47f42f89bbffff48

  • SHA1

    02d9621591090f4c15469ecdc7c14360a6d07977

  • SHA256

    a5106a4962c79d0edad85a7999939c0eccde0225a68ac5a150e7b4ebfcb360e3

  • SHA512

    471299c6b15c8b2cdc74ca04cea7b53d467d0d480dbe467072c276256ea6cd4b0b25744900387221a61465f09119eecda4292f1d4c78afdc01cc61e7d0d1042d

  • SSDEEP

    6144:4zWPYSc7LT8VFna9pXysJkIddwXQeYBayx4MRzuKj7q6idKaMAXZFi:4z4s0Fa9IsJ3Fgg4HKjWKaMk7i

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 3 IoCs
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (199) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Disables Task Manager via registry modification
  • Drops startup file 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Deobfuscate/Decode Files or Information 1 TTPs 1 IoCs

    Payload decoded via CertUtil.

  • Drops desktop.ini file(s) 64 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Interacts with shadow copies 3 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 42 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

Processes

  • C:\Users\Admin\AppData\Local\Temp\bee3166e-ee10-4712-aa10-231525ee781c.exe
    "C:\Users\Admin\AppData\Local\Temp\bee3166e-ee10-4712-aa10-231525ee781c.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2776
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\7zS8DAC3097\5031.bat" "
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2840
      • C:\Windows\SysWOW64\certutil.exe
        CERTUTIL -f -decode "C:\Users\Admin\AppData\Local\Temp\7zS8DAC3097\5031.bat" "C:\Users\Admin\AppData\Local\Temp\DJBuzzRadio.vbs"
        3⤵
        • Deobfuscate/Decode Files or Information
        • System Location Discovery: System Language Discovery
        PID:2848
      • C:\Users\Admin\AppData\Local\Temp\DJBuzzRadio.vbs
        "C:\Users\Admin\AppData\Local\Temp\DJBuzzRadio.vbs"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2804
        • C:\Users\Admin\AppData\Roaming\svchost.exe
          "C:\Users\Admin\AppData\Roaming\svchost.exe"
          4⤵
          • Drops startup file
          • Executes dropped EXE
          • Adds Run key to start application
          • Drops desktop.ini file(s)
          • Sets desktop wallpaper using registry
          • Suspicious behavior: AddClipboardFormatListener
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2912
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2700
            • C:\Windows\system32\vssadmin.exe
              vssadmin delete shadows /all /quiet
              6⤵
              • Interacts with shadow copies
              PID:2744
            • C:\Windows\System32\Wbem\WMIC.exe
              wmic shadowcopy delete
              6⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:764
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2460
            • C:\Windows\system32\bcdedit.exe
              bcdedit /set {default} bootstatuspolicy ignoreallfailures
              6⤵
              • Modifies boot configuration data using bcdedit
              PID:2628
            • C:\Windows\system32\bcdedit.exe
              bcdedit /set {default} recoveryenabled no
              6⤵
              • Modifies boot configuration data using bcdedit
              PID:2908
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:1532
            • C:\Windows\system32\wbadmin.exe
              wbadmin delete catalog -quiet
              6⤵
              • Deletes backup catalog
              PID:636
          • C:\Windows\system32\NOTEPAD.EXE
            "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Womp-Womp.txt
            5⤵
              PID:1632
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2256
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2044
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:1096
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
          PID:1728

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\ProgramData\Adobe\Updater6\Womp-Womp.txt

          Filesize

          17B

          MD5

          1aae33bf814be3680af0c9e9d3f6bf06

          SHA1

          17cb8561c9d25c03eebd8691cd19f90b50916662

          SHA256

          6cab9d341be7e586c79eb547831906554eb6c12662a680e0992ed181a0ba691c

          SHA512

          a28b1ac387afa4c6c5c76c3e510e7de58d426b12dd06d5efe3348214842a7da5621cf8a1bac93f609b140ed4c4c524784886f027c254c65525478219f699661d

        • C:\Users\Admin\AppData\Local\Temp\7zS8DAC3097\5031.bat

          Filesize

          328KB

          MD5

          fec779e7d103f76e22ebfad048bf0ac7

          SHA1

          cc8ea5c01494133052cb04611ac9c217dbd68822

          SHA256

          f98e0151bbf8a2b234d386a1144e0c6aea9805eb8de83a305bcc1bbd47c6970d

          SHA512

          8c5f4b4d63810658e9c2bd73aa3e59f39fc046bf1dd62a9c7993c5e4aa1391b3ab7686d3781c1f64e2c18ebb13f364206bc0944d6ddf517e3de56db6d310164b

        • C:\Users\Admin\AppData\Local\Temp\DJBuzzRadio.vbs

          Filesize

          238KB

          MD5

          86faf18098e56c8c610b960d684a21d8

          SHA1

          db0eb3968c11da86490b679e7daded59b6006310

          SHA256

          4e758d011d1d615ebd05c6ffe441dedf5d371efb1dca1c624ec896f56de19979

          SHA512

          8c87c1847edeb56fc46d0e1adcf3bb8cc024d63fa9d2d49dd7bda68efb1c5fe473f001250408accccb86915cc5f077a46a28189b073cdd557d9042e48c7f4a9b

        • C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Notepad.lnk

          Filesize

          1B

          MD5

          d1457b72c3fb323a2671125aef3eab5d

          SHA1

          5bab61eb53176449e25c2c82f172b82cb13ffb9d

          SHA256

          8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

          SHA512

          ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

        • memory/2804-24-0x0000000000E60000-0x0000000000EA2000-memory.dmp

          Filesize

          264KB

        • memory/2912-30-0x0000000000040000-0x0000000000082000-memory.dmp

          Filesize

          264KB